call back

Noun

callback (plural callbacks)

1. The return of a situation to a previous position or state; a reference to such a position or state.
   • Aiden Gillen whimpers on his knees, stretching for the first time in years. And finally Sansa sentences him, and Arya swings the sword, or dagger as the case may be. For all the historical callbacks in the episode, and in its old age Game Of Thrones keeps portentously reciting old lines verbatim...2017 August 27, Brandon Nowalk, “Game Of Thrones slows down for the longest, and best, episode of the season (newbies)”, in The Onion AV Club

   Synonyms:

   hark-back

2. A return telephone or radio call; especially one made automatically to authenticate a logon to a computer network.
   • For example, multiple callbacks might be made to a nonanswered number to increase the response rate.2007, James M. Lepkowski, Clyde Tucker, J. Michael Brick, Advances in Telephone Survey Methodology, page 318
3. A product recall because of a defect or safety concern.
4. A function pointer passed as an argument to another function.
   • Historically, all viable frameworks have always provided a mechanism to implement callbacks. C# goes one step further and encapsulates callbacks into callable objects called delegates.2010, Trey Nash, Accelerated C# 2010, page xxvi
5. A follow-up audition in casting.
6. A follow-up interview in employment recruiting.

See all 8 meanings of callback